The invention provides a method of preventing coconut tree type plant organs from hitting people, comprising the following steps: building a benchmark thermal database, wherein the benchmark heat database contains infrared thermogram data corresponding to the normal growth state, withered state, matured state and diseased state of plane organs respectively; using a thermal infrared imager to detect plants; and comparing the detection data of the thermal infrared imager with the data in the benchmark thermal database, and removing plant organs when detecting that the plant organs are withered, matured or diseased. Through the method, temperature measurement and thermal state analysis can be carried out without climbing and damaging trees or affecting the tree growth and the beauty effect, a lot of trees can be detected quickly, withered or diseased plant organs can be found efficiently, and potential safety hazard can be removed in advance. The method is applicable to trees with the characteristics of large fruit size and large leaf mass, such as coconut trees, grapefruit trees and jackfruit trees, is easy to implement, does not take up other social resources, and is of low implementation cost.